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28035多路EPWM同步输出问题

大家好!目前本人正在使用ePWM1、2、3、4进行多路PWM波信号的同步输出,但调试时发现四路PWM信号无法同时输出,最多只能正常输出三路,例如ePWM1、2、3或者ePWM1、2、4可以正常输出,但当EPWM1234中断同时开通时ePWM4通道(ePWM4A)的输出被强制拉高了,无法正常输出,不知道问题出在哪里,请大家指教~~